Cyanide Ammonia Leaching Of Copper Gold Ores

TREATMENT OF A COPPER - RICH GOLD ORE BY AMMONIA …

TREATMENT OF A COPPER- RICH GOLD ORE BY AMMONIA ASSISTED CYANIDE LEACHING Figure 4 Effect of Pb(NO 3) 2 on the extraction of gold (NaCN: 15 g/L) The pretreatment of the ore by ammonia (1 M) was therefore, investigatedin an attempt to remove easily solubilised copper ahead of …

Treatment of copper-rich gold ore by cyanide leaching

The treatment of a copper sulphide-bearing gold ore by direct cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching was investigated Dissolution behaviour of gold and copper in these leaching systems was demonstrated Severe interference by the copper containing sulphides with cyanide leaching of gold is observed at ρ(NaCN)≤5 g/L

(PDF) Treatment of a Copper-Rich Gold Ore by Ammonia

Copper minerals present difficulties during the cyanide leaching of gold ores leading to excessively high consumption of cyanide (and oxygen) coupled with low extraction of gold Copper cyanide species, if present at high levels, adversely affects the downstream processes such as the activated carbon adsorption and the effluent treatment

Use of the ammonia cyanide leach system for gold copper

INTRODUCTION The use of Ammonia Cyanide mixtures for the control of cyanide consumption in high copper gold ore is a relatively old process and was first recorded by B Hunt [1] in 1901 Since that time various authors have reported on the use of the system, Jarman & Brereton & Le Gay 1905 [2], Putnam G L 1950 [3], Ruane M (1988) [4]

Industrial Application of Ammonia Assisted Cyanide

AMMONIA ASSISTED CYANIDE LEACHING 31 Previous Work The use of ammonia to reduce the consumption of cyanide during the leaching of gold from copper-bearing ores was patented in 1902 by Bertram Hunt (Hunt 1902), during the first period of intense R&D activity in gold metallurgy that followed the invention of the cyanide process by JS MacArthur and the Forrest brothers in the late 1880s

Industrial Application of Ammonia Assisted Cyanide

ammonia into the cyanide leaching system to suppress the dissolution of copper, without adversely affecting the extraction o f gold, as described in som e detail in the next section of this paper

Eliminating Copper from Gold Ore

Copper minerals, even though minor components of precious metal ores, dissolve in these cyanide leaching solutions, consume cyanide, cause fouling of mill solutions, and thus interfere with the precipitation and recovery of gold2,3,4 Here is a summary of laboratory investigations on the use of cyanide solutions as extractants for copper from

The selective leaching of copper from a gold–copper

cyanide and ammonia have detrimental environmental effects Muir et al (1989) reported that there arefive methodologies for treating copper–gold ores: (1) float and produce a copper–gold con-centrate for smelting; (2) selectively mine and cyanide leach ore with b05% Cu as oxidised minerals andb1% as sulphidic minerals;

The mechanism of gold extraction and copper precipitation

Abstract The cyanide-ammonia system is known as an alternative system for the treatment of complex copper-gold ores Thermodynamic research on the Au Cu(Cu2O, Cu2S) CN− NH4+ O2 OH− H2O systems resulted in producing log(mol)-mol diagrams and δG values for relevant reactions

Gold leaching in cyanide-starved copper solutions in the

Kinetics of gold dissolution Gold leaching kinetics in free cyanide (11 mM CN−)andcopper– cyanide–glycine containing 55 mM Cu(I), 11 mM CN− and 1 g/L (133 mM) glycine solutions were conducted for 2 h at pH 115 and the results are shown in Fig

The mechanism of gold extraction and copper precipitation

Abstract The cyanide-ammonia system is known as an alternative system for the treatment of complex copper-gold ores Thermodynamic research on the Au Cu(Cu2O, Cu2S) CN− NH4+ O2 OH− H2O systems resulted in producing log(mol)-mol diagrams and δG values for relevant reactions

Leaching of Gold-Copper Ores Using Ammoniacal Cynide

A wide variety of copper-bearing gold ores exist throughout the world which have yet to be processed economically for gold recovery The copper minerals present in these ores can be many and varied and usually result in high cyanide consumptions and problematical levels of copper in leach solutions

Treatment of A Copper-Rich Gold Ore by Cyanide Leaching

Abstract: The treatment of a copper sulphide-bearing gold ore by direct cyanide leaching, ammonia pretreatment and ammoniacal cyanide leaching was investigated Dissolution behaviour of gold and copper in these leaching systems was demonstrated Severe interference by the copper containing sulphides with cyanide leaching of gold is observed at ρ(NaCN)≤5 g/L This is consistent with …

Copper and cyanide recovery from barren leach solution at

leach considerably slower in cyanide (Adams, 2000) As a result of cyanide soluble copper in the ore, cyanidation of gold‐copper ores results in high cyanide consumptions and difficulty in process control The gold leaching reaction in cyanide solution follows these electrochemical half‐reactions:

A Review of Ammoniacal Thiosulfate Leaching of Gold: An

many decades have passed without much progress on gold leaching with thiosulfate In 1979, Berezowski and Sefton (1979) renewed interest in the use of ammonium thiosulfate for the recovery of precious metals from a copper sulfide ore Subsequently, studies on leaching different kinds of gold ores

Influence of copper minerals on cyanide leaching of gold

In elucidating the influence of copper minerals on cyanide leaching of gold, copper minerals were classified into two types according to their solubility in cyanide solutions by proposing two concepts, cyaniding easily soluble copper (E Cu) and cyaniding insoluble copper The former involves copper occurrence in metal, oxides and secondary

Ammonia/nitric Acid Leaching of Copper- Cobalt Oxidized …

Ammonia solution as a leaching medium for base metals can be considered as an excellent alternative for acidic solutions The reason for this is its very high stability constant of ammonia complexes for silver, gold, cobalt, copper, nickel and zinc

Ammonia Leaching: A New Approach of Copper Industry in

Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching have resulted in a new approach in the world to this method

The Metallurgy of Cyanide Gold Leaching – An Introduction

The Metallurgy of Cyanide Gold Leaching – An Introduction Leaching gold with a cyanide solution remains the most widely used hydrometallurgical process for the extraction of gold from ores and concentrates Despite the difficulties and hazards of working with cyanide, no other process has yet been proven to be an economic viable alternative A

Gold cyanidation - Wikipedia

Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex

The leaching and adsorption behaviour of gold ores

from the dissociation of the complex is used to leach gold from the ore The stepwise dissociation of cyanide from copper-cyanide complexes can also be used to leach gold from a variety of oxide and sulphide ores The copper cyanide's fourth ligand readily dissociates at low cyanide concentrations for use in gold leaching

Treatment of A Copper-Rich Gold Ore by Cyanide Leaching

After ammonia traditional cyanide leaching, ammonia cyanide system pretreatment of the tailings with 03 mol/L NH3 + 01 allows selective leaching of gold from copper-gold ores mol/L NH4+, which resulted in a copper extraction of with remarkably reduced consumption of cyanide [18]

A Study of the Effect of Djurliete, Bornite and

ammonia-cyanide leaching (Hunt process) for the extraction of gold from ores containing a high concentration of copper in the 1990s [1–6] and 2000s [7,8] Early work on leaching of the Buzwagi

Gold extraction - Wikipedia

Thiosulfate leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing: the absorption by carbonaceous components which preferentially absorbs gold and gold-cyanide complexes

copper mining cyanide gold extraction

Treatment of copper rich gold ore by cyanide leaching, ammonia The treatment of a copper sulphide bearing gold ore by direct cyanide leaching Extraction of gold from Mastra gold mine by ammoniacal cyanide leaching [D],

leaching of gold copper ores with ammoniacal cyanide solutions

Fig 7 pH-dependent stability of copper species in ammonia solution under experimental conditions (1 mol/L NH 3 and 11% Cu in ore at 25% pulp density) [33] 33 Ammoniacal cyanide leaching Ammoniacal cyanide leaching has been proposed for the treatment of gold ores that contain reactive copper in appreciable quantities [4,5,8,34]

Alternative lixiviants to cyanide for leaching gold ores

Effect of silver in thiosulfate leaching of gold-silver alloys in the presence of copper and ammonia relative to pure gold and silver Oraby, E ; Browner, Richard ; Nikraz, Hamid ( 2014 ) One promising alternative to cyanide for the leaching of gold is thiosulfate due to its low toxicity and efficiency in leaching gold from low-grade and carbonaceous ores and concentrates

e traction of gold by cyanide process

(PDF) Treatment of a Copper Rich Gold Ore by Ammonia Assisted Aug 1, 2018 Cyanidation process is extensively used for leaching of gold from ores since resulting in low extraction of gold and high consumption of cyanide (Dawson et

Treatment of A Copper-Rich Gold Ore by Cyanide Leaching

After ammonia traditional cyanide leaching, ammonia cyanide system pretreatment of the tailings with 03 mol/L NH3 + 01 allows selective leaching of gold from copper-gold ores mol/L NH4+, which resulted in a copper extraction of with remarkably reduced consumption of cyanide [18]

Assesment of Ammoniacal Ammonium Sulphate Leaching as …

cyanide leaching of gold ores Sceresini (2005) also reported that the addition of lead nitrate improved the extraction of gold from a copper bearing sulphide ore presumably due to the alleviation of sulphide effect

The leaching and adsorption behaviour of gold ores

from the dissociation of the complex is used to leach gold from the ore The stepwise dissociation of cyanide from copper-cyanide complexes can also be used to leach gold from a variety of oxide and sulphide ores The copper cyanide's fourth ligand readily dissociates at low cyanide concentrations for use in gold leaching

pictures ammonia leaching of copper | Solution for ore mining

ammonia leaching of copper – Grinding Mill China Ammonia leaching – Phelps Dodge Corporation Aug 21, 1979 · An improved process for obtaining copper from a copper sulfide, in which:… ammonia leaching of copper oxide – OneMine Mining and Minerals … ammonia leaching of copper oxide – OneMine Mining and Minerals Library search results

THIOSULPHATE LEACHING - sgs

Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide Although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological advantages including its lower toxicity and greater efficiency with gold …

INFLUENCE OF LEAD NITRATE ON CYANIDE LEACHING OF …

(HCu) and Mastra Low Copper (LCu) ores Equipment and experimental procedure All experimental works were conducted at the Metallurgy Laboratory of Ovacik Gold Mine The Havran and Ovacik ore samples were taken from the Fine Ore Bin of the Ovacik cyanide leaching plant, while the Mastra ore was supplied from Gumushane region of Turkey

Thiosulfate-copper-ammonia leaching of pure gold and

Thiosulfate-copper-ammonia leaching of pure gold and pressure oxidized concentrate The industrially applied leaching method for gold ores and concentrates involves the cyanide-free method into the market However, a few accidents have been reported involving facilities using cyanide in gold leaching (Macklin et al, 2003) Therefore,

Cyanide and Other Lixiviant Leaching Systems for Gold with

Alkaline lixiviant systems (pH > 10)include cyanide, ammonia-cyanide, ammonia, sulphide, nitriles, and a few other minor possibilities Oxygen is the main oxidant Selection of a leaching system for gold involves consideration of ore texture and mineralogy, chemical requirements, leaching techniques, the development of flowsheets, and

ammonia in the cyanide gold process - royalcrescentgroup

Gold leaching in cyanide-starved copper solutions in the cyanide consumptionusing acyanide–ammonia system in to the gold production process … COMPARISON OF CYANIDE AND THIOSULPHATE … COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING FOR GOLD 523 Effect of Ammonia if an accident occurs in the process because of the toxicity of cyanide

Application of SART to Heap Leaching of Gold-Copper

for every kg of cyanide soluble copper extracted Therefore, if the ore has 40 g/t of cyanide-soluble copper, then the minimum quantity of cyanide required for copper leaching is 01 kg NaCN/t If the quantity of copper extracted increases to 300 g/t then the cyanide requirement increases to 07 kg NaCN/t Viewed another way, since the 3 moles